/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.aliyun.oss.common.comm.io;

import java.io.IOException;
import java.io.InputStream;

public class FixedLengthInputStream extends InputStream {

	private InputStream wrappedInputStream = null;
	private long length = 0;
	
	public FixedLengthInputStream(InputStream instream, long length) {
		if (instream == null || length < 0) {
			throw new IllegalArgumentException("Illegal input stream or length");
		}
		
		this.wrappedInputStream = instream;
		this.length = length;
	}
	
	public InputStream getWrappedInputStream() {
		return wrappedInputStream;
	}

	public void setWrappedInputStream(InputStream instream) {
		this.wrappedInputStream = instream;
	}

	public long getLength() {
		return length;
	}

	public void setLength(long length) {
		this.length = length;
	}

	@Override
	public int read() throws IOException {
		return wrappedInputStream.read();
	}
}
